JoeMuc2009 wrote: > Hi Philippe, > > to be honest, I never cared much about it. Even if we found the failing > part, replacing it would only end in the replacement failing again some > day. The circuitry needs an adjustment to eventually stabilize for long > term operation. But that's definitely out of my range right now, I'm not > good at reverse engineering and schematics will never become available. > I just noticed that I never took a good photo from the Boom PCB's front > side when the display was off. The only picture I have is in the > attachment, the suspects being marked by the yellow box. The area is > very close to the right-side connection of the filament wire, and > usually hidden behind the display. One of the parts is getting really > really hot (beyond my IR camera's 105°C limit). I'll have to check the > voltages and currents in a defective and a working Boom to compare them > - once I get to it. I also never took temperature measurements in a > working Boom so it may be by design that this red-hot part operates at > such a level. We'll see. > It's probably an overloaded MosFET or a shorting capacitor that causes > the issue. > > Regards, > Joe
BTW, when you unsolder the VFD, do you use hot airflow and heat up all the pins to remove it intact or so you cut them and unsolder the remaining pieces one by one using just a soldering iron. I might change one soon and I was thinking of fixing as well the Vref for filament heating changing the (probably) mosfet. But the existing VFD is not fully dead, so conserving it might be a good idea Envoyé de mon iPad en utilisant Tapatalk LMS 7.7, 7.8 and 7.9 - 5xRadio, 3xBoom, 4xDuet, 1xTouch, 1 SB2. Sonos PLAY:3, PLAY:5, Marantz NR1603, JBL OnBeat, XBoxOne, XBMC, Foobar2000, ShairPortW, JRiver 21, 2xChromecast Audio, Chromecast v1 and v2, , Pi B3, B2, Pi B+, 2xPi A+, Odroid-C1, Odroid-C2, Cubie2, Yamaha WX-010, AppleTV 4, Airport Express, GGMM E5 ------------------------------------------------------------------------ philippe_44's Profile: http://forums.slimdevices.com/member.php?userid=17261 View this thread: http://forums.slimdevices.com/showthread.php?t=109374
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